Arm backend: Add pre-push checks for op tests (#9899)

- Check that @SkipIfNoCorstone is not used
- Check that @expectedFailureOnFVP is not used
- Check that unittest.TestCase is not used
- Check that on_fvp suffix is not used
- Check that op and target is parsed from the test name

Signed-off-by: Adrian Lundell <adrian.lundell@arm.com>